Package de.esoco.data.storage

Schnittstelle StorageAdapter

Alle bekannten Implementierungsklassen:
AbstractStorageAdapter
public interface StorageAdapter
The interface for storage adapters that perform storage access based on data elements.

  • Methodenübersicht

    Modifizierer und Typ
    Methode
    Beschreibung
    List<de.esoco.lib.model.ColumnDefinition>
    getColumns()
    Returns the definitions of the columns of the storage query.
    Object
    getCurrentQueryCriteria()
    An optional operation that returns the current query criteria of this instance.
    QueryResultElement<de.esoco.lib.model.DataModel<String>>
    performQuery(StringDataElement queryParams)
    Must be implemented by subclasses to perform a query.

  • Methodendetails

    • getColumns

      List<de.esoco.lib.model.ColumnDefinition> getColumns()
      Returns the definitions of the columns of the storage query.
      Gibt zurück:
      A list of column definitions (may be NULL)

    • getCurrentQueryCriteria

      Object getCurrentQueryCriteria()
      An optional operation that returns the current query criteria of this instance. The result of this method may only be valid after a call to performQuery(StringDataElement). What kind of object is returned depends on the implementation.
      Gibt zurück:
      The current query predicate or NULL if no query has been executed yet

    • performQuery

      QueryResultElement<de.esoco.lib.model.DataModel<String>> performQuery(StringDataElement queryParams) throws Exception
      Must be implemented by subclasses to perform a query. The query parameters data element must contain the mandatory query properties from StorageProperties.
      Parameter:
      queryParams - A data element containing the query parameters
      Gibt zurück:
      A query result data element
      Löst aus:
      Exception - If executing the query fails